The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2003
Filed:
Jun. 29, 2000
Applicant:
Inventor:
Teruo Saito, Ushiku, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23C 1/12 ; B23C 3/16 ; B23C 3/00 ;
U.S. Cl.
CPC ...
B23C 1/12 ; B23C 3/16 ; B23C 3/00 ;
Abstract
This invention aims at avoiding interference of a blade when a plurality of grooves of a diffraction grating element are formed. In order to achieve this object, in a method of working a diffraction optical grating element shape on a working target surface, a main spindle for rotatably supporting a cutting blade is provided on X-, Y-, and Z-coordinate axes of the working target surface, and an angle of an edge of the cutting blade mounted on the main spindle performs working to have an inclination with such an angle that interference with a planned working position at an outer peripheral portion of a curved surface of the diffraction optical grating element is avoided.